Rocketship, sure you could use a block, but unless its first verified to be flat, it could create more warpage problems than what you have now. Used blocks are routinely out-of-plane both lengthwise and crosswise, and overheating them causes even more movement, so most shops true up blocks before using them in performance builds. A steel or aluminum deck-plate on the other hand is a shop tool and normally doesn't see engine heat or vibration.
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